Quote Originally Posted by Scott Larson View Post
Sue, in my opinion, no. It is has detergent qualities but it is not harsh, I've never experienced any problems nor would I expect any. I've used Amsoil Engine Cleaner in several engines with only good results also...The "false seals" you're referring to really only show-up in high-mileage, truly dirty engines.
Mechanical backgroud?

Assuming yes...if you buy into the benefit of MMO, what about "Motor Flush"for higher concentrated (oil-change) flushing? Seems like this would be the next level of treatment really hoping to free up engine sludge.

I'm thinking it's mosting Naptha...and you add a whole quart, idle for a few minutes, then dump....and change oil.